<爬虫>黑板爬虫闯关02

import requests

from lxml import etree

'''

	黑板爬虫闯关02

	网址:http://www.heibanke.com/lesson/crawler_ex01/

'''

url = "http://www.heibanke.com/lesson/crawler_ex01/"

data = {

	'username':"shuimo",

	'password': 0,

}

for i in range(30):

	data['password'] = i

	res = requests.post(url,data=data)

	res.encoding="utf8"

	html = etree.HTML(res.content)

	info = html.xpath("//h3/text()")[0][4:8]

	if info != "密码错误":

		url = "http://www.heibanke.com" + str(html.xpath('//a[@class="btn btn-primary"]/@href')[0])

		print("下一关的网址是:%s"%url)

		print("闯关成功的数字是%d"%i)

		break